Cross-client authorization

[Michael Doo]

I'm attempting to do cross-client authorization for an app I'm writing. I've modified my requests to include the audience field in both the auth request and the token request. However, the token returned is missing the server_code field that I need.

The Google Sign-In library supports this feature. However, the app I'm working on needs to allow a single user to authorize multiple Google accounts, so I'm stuck using the Google Toolbox for Mac solution. If there are other iOS library that support this, let me know.

The token request parameters whose response I expect a server_code field in:

audience  <server client ID>.apps.googleusercontent.com
client_id <iOS app client ID>.apps.googleusercontent.com
client_secret <iOS app client secret>
code  4/GrpT1WGXsz4ertF97fchDU0SsXYGNJfzeWrcJF6VH5c
grant_type  authorization_code
redirect_uri  urn:ietf:wg:oauth:2.0:oob
scope https://mail.google.com/ https://www.googleapis.com/auth/userinfo.email

[Greg Robbins]

Cross-client authorization isn't an approach we've tried with the GTM OAuth 2 library. You might find more assistance by posting the question on StackOverflow and including the relevant http request and response from your client.

[Michael Doo]

Posted.